Home  >  Article  >  Backend Development  >  Summarize the php case conversion formula

Summarize the php case conversion formula

PHPz
PHPzOriginal
2023-04-10 09:35:21489browse

When writing PHP programs, it is often necessary to perform case conversion operations on strings. The following are several commonly used case conversion functions:

  1. strtoupper() – Convert all characters in the string to uppercase

Syntax: strtoupper( string $string)

Example:

$str = 'Hello World';
echo strtoupper($str);    // 输出 HELLO WORLD
  1. strtolower() – Converts all characters in the string to lowercase

Syntax: strtolower(string $string)

Example:

$str = 'Hello World';
echo strtolower($str);    // 输出 hello world
  1. ucfirst() – Convert the first letter of the string to uppercase

Syntax: ucfirst(string $string)

Example:

$str = 'hello world';
echo ucfirst($str);    // 输出 Hello world
  1. ucwords() – Convert the first letter of each word in the string For uppercase

Syntax: ucwords(string $string)

Example:

$str = 'hello world';
echo ucwords($str);    // 输出 Hello World

These functions are very useful during program development, It can help us quickly deal with case problems in strings and improve the efficiency of writing code. In addition, PHP also supports other string conversion functions, such as:

  1. mb_strtolower() – Converts all characters in the string to lowercase (MB function library supports multi-byte characters)

Syntax: mb_strtolower(string $string [, string $encoding = mb_internal_encoding() ])

  1. mb_strtoupper() – Change the All characters are converted to uppercase (MB function library supports multi-byte characters)

Syntax: mb_strtoupper(string $string [, string $encoding = mb_internal_encoding() ])

In general, using these case conversion functions in PHP allows us to process strings more conveniently and improve the readability and maintainability of the code.

The above is the detailed content of Summarize the php case conversion formula. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn